Bundle grep command

[rainerborene]

It would be great to provide a bundle grep command. Bgrep would search on the directories listed on bundle show --paths.

[tpope]

If someone wants to make an attempt at this I'll entertain it. I tried to do something similar for 'runtimepath' once and vaguely recall issues with the length of the argument list, so make sure you try on a suitably large gem set.